def close(self):
"""Close this send channel object synchronously.
All channel objects have an asynchronous `~.AsyncResource.aclose` method.
Memory channels can also be closed synchronously. This has the same
effect on the channel and other tasks using it, but `close` is not a
trio checkpoint. This simplifies cleaning up in cancelled tasks.
Using ``with send_channel:`` will close the channel object on leaving
the with block.
"""
if self._closed:
return
self._closed = True
for task in self._tasks:
trio.lowlevel.reschedule(task, Error(trio.ClosedResourceError()))
del self._state.send_tasks[task]
self._tasks.clear()
self._state.open_send_channels -= 1
if self._state.open_send_channels == 0:
assert not self._state.send_tasks
for task in self._state.receive_tasks:
task.custom_sleep_data._tasks.remove(task)
trio.lowlevel.reschedule(task, Error(trio.EndOfChannel()))
self._state.receive_tasks.clear()
async def receive(self) -> Message:
"""Return the next available message from the connection"""
while True:
msg = self.parser.get_next_message()
if msg is not None:
return msg
b = await self.socket.receive_some()
if not b:
raise trio.EndOfChannel("Socket closed at the other end")
self.parser.add_data(b)
async def receive(self) -> Message:
"""Return the next available message from the connection"""
async with self.recv_lock:
while True:
msg = self.parser.get_next_message()
if msg is not None:
return msg
# Once data is read, it must be given to the parser with no
# checkpoints (where the task could be cancelled).
b, fds = await self._read_data()
if not b:
raise trio.EndOfChannel("Socket closed at the other end")
self.parser.add_data(b, fds)
async def aclose(self):
if self._closed:
await trio.hazmat.checkpoint()
return
self._closed = True
for task in self._tasks:
trio.hazmat.reschedule(task, Error(trio.ClosedResourceError()))
del self._state.send_tasks[task]
self._tasks.clear()
self._state.open_send_channels -= 1
if self._state.open_send_channels == 0:
assert not self._state.send_tasks
for task in self._state.receive_tasks:
task.custom_sleep_data._tasks.remove(task)
trio.hazmat.reschedule(task, Error(trio.EndOfChannel()))
self._state.receive_tasks.clear()
await trio.hazmat.checkpoint()